Why are image editing apps so limited in their functions?

[SideshowSid]

Im sick of having to download a new app for every image editing tool I need to meet my wants.. I just want to customize my art, but i need one app to make a descent negative image, another one to make an image thinner or wider, another to properly change color hues and saturation.. I don't want to make a selfie look cute, I just want to modify images properly without having to pay upfront for an app unless I can actually see that it offers the features that I want with a comprehensive UI.

 

[modifier]

Have you tried Adobe Lightroom and/or Google Snapseed?

 

[ManiacJoe]

Snapseed and Photoshop Express are the two editors I have on my phone.

Which editors have you tried and what features were missing in each?

 

[SideshowSid]

Im using Pixlr for color hue adjustments, Photo Director for the overlay/image blend and text over image fuctions, Negative Image (self explanatory) and Make Me Thin to adjust size without keeping a balanced proportion ratio... These all work well for each reason I mentioned, but I'd just like to have one app that does all these things well.
Ive tried Adobe Photoshop Express, and it didn't seem much better than Photo Director or Pixlr..

 

[ManiacJoe]

You are definitely trying to do more editing on the phone than me. For what you are doing, I would normally go directly to Photoshop on my PC.